Malicious PDF — malware analysis report

Static analysis result for SHA-256 04413f6497a9d92d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 18:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66bf816710cb70385332365409a02b64 SHA-1: 37136b55f7f84da2ceaedced4290e7cc66b48e0a SHA-256: 04413f6497a9d92dbf516b8274b87aef150f7856b3875a39d40d3429281b5df3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct PDF files hosted on various domains. The embedded URLs and the PDF's structure suggest an attempt to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mabuksusu.com/contents/files/33060308006.pdf In PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/xuwuro.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/luraxuxewofijeliluni.pdfIn PDF document text
    • http://logicamail.it/draft/media/2353254768.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07c92530a---zarimuzo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a061254f---fumisapevazumotuzamejeri.pdfIn PDF document text
    • https://go2germany.ru/files/file/xefopifisejilek.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nadekodipazefarimapofe.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/96398265875.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zuwuzenalamupivimepesu.pdfIn PDF document text
    • https://costarica4d.com/contents/files/xumuviwov.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16137d157ed522---18886091593.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/dupumalumojilevevekijup.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/71408292525.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/loweluzawujadobovimaw.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/67117470537.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/ramutur.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/73347379590.pdfIn PDF document text
    • https://bfull.ru/uploads/files/fagatelekabu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/lujuv.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/latisipezixaroka.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/tavozulokar.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/93593033921.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bitov.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/zuzobuderesovejonuxuxapel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=film+hd+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 17408 bytes
SHA-256: e1df63b076a246827bfde8fd0726b23ec249594c9a5b143ad77e86f04b8a7cc6
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10316 bytes
SHA-256: cbb2224f159a1e90c6164941d06c00228c1827ca8a33d567b07ad3cd760c8ad7